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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>扁平化数组</title>
</head>

<body>

</body>
<script>
    function fn(array, result = []) {
        for (let i of array) {
            if (Array.isArray(i)) {
                fn(i, result)
            } else {
                result.push(i)
            }
        }
        return result
    }
    let s = fn([1, 2, 3, [1, 2, 2, 3, [4, 5, 6]]])
    console.log([...new Set(s)]);
</script>

</html>
